scripts: refine static linking check to better guide the user

The current mechanism to check if static linking is possible, and the mesage
displayed on failure, can be puzzling to the unsuspecting user.

Also, the current implementation is not using the existing infrastructure,
and is thus difficult to enhance with new tests.

So, switch to using the standard CT_DoExecLog infra, and use four tests to
check for the host compiler:
- check we can run it
- check it can build a trivial program
- check it can statically link that program
- check if it statically link with libstdc++

That should cover most of the problems. Hopefully.

(At the same time, fix a typo in a comment)

Signed-off-by: Daniel Price <daniel.price@gmail.com>
[yann.morin.1998@free.fr: split original patch for self-contained changes]
[yann.morin.1998@free.fr: use steps to better see gcc's output]
[yann.morin.1998@free.fr: commit log]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <163f86b5216fc08c672a.1353459722@nipigon.dssd.com>
Patchwork-Id: 200536

 Original patch from Gentoo.

 -= BEGIN original header =-

 ARMV5 can use STRD and LDRD access instructions but these accesses need to be 

 8 byte aligned. The dynamic linker's malloc needs to match this so structures

 become 8 byte aligned to void unaligned accesses.

 RP - 14/02/2008

 -= END original header =-

 diff -durN uClibc-0.9.30.orig/ldso/ldso/arm/dl-sysdep.h uClibc-0.9.30/ldso/ldso/arm/dl-sysdep.h

 --- uClibc-0.9.30.orig/ldso/ldso/arm/dl-sysdep.h	2008-09-25 10:35:20.000000000 +0200

 +++ uClibc-0.9.30/ldso/ldso/arm/dl-sysdep.h	2009-02-07 09:57:59.000000000 +0100

 @@ -15,6 +15,8 @@

    GOT_BASE[1] = (unsigned long) MODULE; \

  }

 +#define DL_MALLOC_ALIGN 8  /* EABI needs 8 byte alignment for STRD LDRD*/

 +

  static __inline__ unsigned long arm_modulus(unsigned long m, unsigned long p)

  {

  	unsigned long i,t,inc;